Only in the past decade have astronomers been able to make sense of the bright flashes of cosmic light known as gamma-ray bursts, which are the brightest explosions in the universe. But two newly observed bursts suggest that not all such flashes can be neatly divided between long bursts associated with supernovae and short bursts due to stellar mergers.<br><br><a href='http://www.berkeley.edu/news/media/releases/2006/12/20_bursts.shtml' target='_blank'>http://www.berkeley.edu/news/media/releases/2006/12/20_bursts.shtml</a><br><br>